On Monday, the iPhone and iPad maker released a new beta version of its software, iOS 7, to developers. According to 9to5Mac, there is a folder in the beta version of the software called a "Biometric Kit" with a string of code that says "A fingerprint that changes colour during the setup process."

Of course this isn't the first time that it has been rumored Apple would build a fingerprint sensor into its hardware. Last July, the tech giant acquired AuthenTec, a company that makes biometric security hardware, for more than $350 million.

Analysts expect the Cupertino, Calif., company to reveal the next generation iPhone this September or October, however, the company has not confirmed an exact date.

Besides a fingerprint sensor, the new phone is also rumored to feature an enhanced camera, an A7 processor and an improved Siri system.